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pressure equation in PISO or SIMPLE algorithm

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Old   January 17, 2012, 05:43
Default pressure equation in PISO or SIMPLE algorithm
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Hi all
I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem
pressure equation is
laplacian(rAU, p) == fvc::div(rAU*UEqn.H())
but in OpenFoam rAU*UEqn.H() is interpolated on cell faces
why we do this work ?

Best Regards
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Old   July 8, 2013, 22:36
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Dongyue Li
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Quote:
Originally Posted by mechy View Post
Hi all
I have a question about pressure equation in PISO or SIMPLE algorithm please guide me in this problem
pressure equation is
laplacian(rAU, p) == fvc::div(rAU*UEqn.H())
but in OpenFoam rAU*UEqn.H() is interpolated on cell faces
why we do this work ?

Best Regards
I think just coz its interpolated on the faces, so it can be expressred by the flux.
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Old   July 22, 2013, 14:17
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Haomin Yuan
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I assume you are looking at incompressible flow solver. "rAU*UEqn.H()" here is actually velocity.
original equation should be "laplacian(rAU, p) == fvc::div(phi) "
phi = fvc::interpolate(U) & mesh.Sf();
U = rAU*UEqn.H()
You should look up Prof. Jasak's thesis, he talked about this in detail in his thesis.
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